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- Welcome to Crash Course Organic Chemistry hosted by Deboki Chakravarti. We'll be tackling the notoriously complicated subject of organic chemistry, and hopefully having some fun along the way.
- A 20-part series examining the basics of important public health topics, created by APHA and Complexly Media
- The Anthropocene is the current geological age, in which human activity has profoundly shaped the planet and its biodiversity.
- An entertaining look at a collection of excessively hazardous chemicals know for their toxicity, explosiveness, corrosiveness, flammability and horrible smell. Their creators challenges in handling these chemicals and some of the historic incidents involving them are described.
- Scientists don't understand sex either. Because it's complicated. Your sexual determination, specified by you genes, doesn't always specify simply male or female but maybe something in between. And your sexual differentiation, which is how your genes are processed into your physical anatomy, doesn't always follow the 'textbook' process. Here's a bunch of ways human sexual development varies from person to person.
- Earth's Mantal is not the fluid uniform magma as most of us have been taught. It contains anomalies such as two content size protrusions under the Pacific and Atlantic Oceans. Geologist speculate they may result from water that has leaked from the oceans into the mantle forming iron peroxide. The protrusions seem to be associated with hot spots on the surface such as the Hawaiian volcanoes.
- Damascus steel was prized for it's ability to produce strong ultra sharp swords. But the recipe was lost in the 1800s. Now it is understood that the steel was produced as crucible steel which permits control of carbon content at lower temperatures though the process takes considerably more time. In addition the iron used to source the steel contained vanadium which is thought to catalyze the formation of iron carbide crystals and also appears to have caused the formation for carbon nanotubes within the steel.
- Tasmanian Tigers, also know as thylocines, were declared extinct in 1986 and there have been no confirmed sightings since around 1940. But that doesn't stop people form seeing them. People really want to find one. Perhaps that's because they were the largest marsupial carnivore to live alongside humans or perhaps because humans caused their demise by hunting them to protect live stock and by introducing competing animals such as dingoes.
- Astronomers generally considered details of the Milky Way's structure unique as the result of an early collision of two galaxies from a time when such collisions would have been rather rare. Think again. The first time an astronomer looked at anther galaxy of the MIly Way's type it found similar structures. In other news astronomers have found a spiral galaxy of record breaking age by looking in the public archives.
- You would think after living here for all of human civilization that geologists would know the Earth pretty well. But Earth is still dishing up strangeness. There are explosions, rumblings, craters, hills etc. that don't fit any of the established geological rules.
- Since they are rampant disease carriers there's been a good deal of research focused on what attracts mosquitoes to people. And there has been some success. Though not silver bullets Hank shares the research results and suggests a few things you can try.
- Baby volcanoes, a miniature mountain ranges and a tiny dessert aren't what they appear to be. A closer look or a broader view reveals aspects of these geological features that aren't so obvious. Volcano turns out to be a geyser or a vent from a gigantic volcano. The mountain range actually is a volcano. And the dessert is home to plants that don't mind a pile of wind blown sand.
- 1.1 billion years ago the super continent of Rodia was breaking up and North America started splitting in two. A mid ocean rift even formed between the eastern and western parts. Just then the separation stopped and the two parts merged together again.
- In 1998 Roy Baumeister published a definitive study showing that ego depletion (meaning will power is a limited resource) is real. But then in 2010 studies began finding the opposite and other labs were unable to reproduce Hagger's results. Controvery ensued and continued to this day (May 2016). But there are also concerns that the experimental methodologies used in the social science may be unreliable.
- It appears that epidemics date back to shortly after the dawn of civilization, perhaps six thousand year ago. Here are 6 epidemics from the past where it is unclear what caused them even though they killed tens of millions of people when human populations were much smaller than today.
- If you're an internet troll you probably know why you do it. If you're not you're probably asking 'why?'. Psychologists have wondered too and have taken an active interest in researching the subject. There seems to be a broad spectrum from people who take advantage of their online anonymity to joke around to people with deep seated psychological problems.
- There are some very good reasons for animals to be deceptive. Not getting eaten or your babies getting eaten is high on the list as is protecting your food supply from thieves. There there's sex. Every guy knows if you want to get the girl you have a better chance if you appear better than you really are. Here's how some animals do it.
- Game theory is a field of mathematics conceived by John Nash that deals with how people handle situations where they are effected by other people's decisions. Hank reviews what game theory has to say about competitive situations so an individual obtains their best result and cooperative situation so individuals obtain a fair result.
- Evolution has accomplished a lot but because it has no idea what's coming next it can't plan ahead. That sometimes results in some pretty cumbersome ways of surviving. But they work so we keep them. Here are five examples with scientists' best explanation of how they came about.
- 2012– 11mTV EpisodeIs it true that there is just a few percent of different between our DNA and chimpanzees? How can that little difference in our DNA make humans so different form chimpanzees? Or are we really all that different? And how do scientist know? And for that matter how do they figure it out?
- 2012– 28mTV EpisodeAren't plastics wonderful? Too bad they're such a problem. They cause pollution. Harm sea life. Maybe even harm us. So what can we do about them? Or are the alternatives even worse? The first step is to understand the problem from every perspective.
- Green diamonds are formed when they occur next to a radiation source such a uranium or thorium ore. The radiation for these elements is strong enough to knock a carbon atom out of the diamond's crystal lattice. If this happen enough the diamond appears green.
- Nobody wants to go to see a doctor. So it's tempting to treat yourself at home. There are plenty of home remedies for many medical conditions and more pop up on the Internet every day. The question is; Do they really work? Here are six the definitely don't.
- Everyone knows koalas are the cutest animal on the planet and love eucalyptus leaves. But eucalyptus is toxic and has very little nutritional value. How do they survive on that? Big surprise, they have a bunch of adaptations. So today, in 2021, now that the fires are out, their biggest challenge is an epidemic of chlamydia.